validation for multiple checkboxes

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I have a group of checkboxes.
I need a validation such that atleast one checkbox must be checked or else I should get a message to select at least one checkbox.

Can any one help me out?

Posted 12-Sep-10 21:37pm

srujanac#

Updated 12-Sep-10 21:48pm

Dalek Dave

v2

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Dalek Dave 13-Sep-10 3:48am

Edited for Grammar.

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Baji Jabbar · Answer 1 · 2010-09-12T22:42:00

Hi
You can use java script to validate it. Here is an example for three check boxes .

XML

<script type="text/javascript" language="JavaScript">
<!--
function checkCheckBoxes(theForm) {
    if (
    theForm.CHECKBOX_1.checked == false &&
    theForm.CHECKBOX_2.checked == false &&
    theForm.CHECKBOX_3.checked == false)
    {
        alert ('Select any check box!');
        return false;
    } else {
        return true;
    }
}
//-->
</script>

if you have more check boxes , use 'for' loop to iterate to find whether any one is checked or not. For this the check box names must be like a indexed one as in example

if your need is not satisfied please read this

Abhishek Sur · Answer 2 · 2010-09-12T23:55:00

Solution 2

You can use

var elements = document.getElementsByName('groupname');

for(var i=0; i< elements.length; i++)
 //check if any elements[i] is checked

:cool:

Posted 12-Sep-10 23:55pm

Abhishek Sur

Comments

srujanac# 13-Sep-10 6:35am

what should my group name be here I have taken checkboxes individually.And there is no property for checkboxes like 'name' in order to give a paticular groupname

Hiren solanki · Answer 3 · 2010-09-13T04:24:00

Solution 3

For a Simple,
Use RequiredFieldValidator to CheckBoxList
it will throw msg if No checkbox is selected.

Posted 13-Sep-10 4:24am

Hiren solanki

Comments

srujanac# 14-Sep-10 5:22am

I tried but its showing me a mesg that we cannot use required field validator to checkboxlist

Hiren solanki 14-Sep-10 5:35am

if you are using C#, then validate it at server side like
if (CheckBoxList1.SelectedIndex > 0) (it mean one of checkbox is checked )

Hiren solanki 14-Sep-10 5:37am

sorry i am not able to edit my comment use CheckBoxList1.SelectedIndex >= 0 to ensure that atlease one checkbox is checked.

raju melveetilpurayil · Answer 4 · 2010-09-13T13:09:00

Solution 4

Check this thread http://www.codeproject.com/Questions/109272/validation-for-checkboxes.aspx[^]

And avoid multiple post.:mad:

Posted 13-Sep-10 13:09pm

raju melveetilpurayil

validation for multiple checkboxes

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